647 4th Avenue
647 4th Avenue in Sunset Park, Brooklyn, has 3 open HPD violations, and 8 of 20 units are rent-stabilized, as of Oct 26, 2026. StreetSpy grade: C (67/100).
Mixed residential & commercial · 20 units · Built 1921
StreetSpy grade: C (Fair, 67/100)
- 3 open housing violations, none in the most serious class.
- The owner's bedbug filings report 2 infested units over the last 3 years.
- The head officer on this registration is named on 40 buildings' registrations; 14 graded D or F.
- 8 of 20 units are rent-stabilized; 15 on the 2007 tax bill.
Fewer open violations per unit than 6 in 10 Brooklyn buildings this size.
- Repairs: Low (3 open), records as of Oct 26, 2026
- Heat and hot water: No complaints, 12 mo, records as of Oct 25, 2026
- Pests: High (2 infested units, 3 yr), records as of Oct 28, 2026
- Safety: Clear (1 open DOB violation), records as of Oct 26, 2026
- Registration: Through Sep 1, 2027, records as of Oct 3, 2026
Housing code violations (HPD)
3 open violations: 0 class C (immediately hazardous), 2 class B, 1 class A. 3 issued in the last 12 months. 126 on record. Oldest open violation issued 2018-10-17. Newest violation issued 2026-08-03.
0 closed in the last 90 days. Median 82 days from issue to close for the 2 violations closed in the last 12 months.
- Class B: Mold, ceiling, bathroom, 3rd floor. HMC: TRACE AND REPAIR THE SOURCE AND ABATE THE VISIBLE MOLD CONDITION... AT CEILING ( APPROX-12 SQ,FT ) WEST WALL ( APPROX- 8 SQ.FT ) AND NORTH WALL ( APPROX-6 SQ,FT ) ABOVE THE 2ND BATHROOM FROM NORTH LOCATED AT APT 9, 3rd STORY, 1st APARTMENT FROM NORTH AT EAST (apt 9), issued 2019-10-31. HPD violation 13381064
- Class B: Mice, 4th floor. ADMIN. CODE: ABATE THE NUISANCE CONSISTING OF MICE LOCATED AT APT 16, 4th STORY, 2nd APARTMENT FROM NORTH AT EAST (apt 16), issued 2018-10-17. HPD violation 12666670
- Class A: Required notice or sign missing (entrance). (B) HMC POST A PROPER NOTICE REGARDING RENT STABILIZATION LAW, IN A FORM APPROVED BY THE COMMISSIONER, IN A CONSPICUOUS LOCATION WITHIN THE COMMON AREA AT THE BUILDINGS ENTRANCE. FOR MORE INFORMATION ABOUT SIGNAGE REQUIREMENTS, PLEASE VISIT: HTTPS://WWW.NYC.GOV/SITE/HPD/SERVICES-AND-INFORMATION/REQUIRED-SIGNAGE.PAGE, issued 2026-08-03. HPD violation 19107866
311 housing complaints
3 in the last 12 months, 13 in 5 years. Most common: Unsanitary Condition (2), Plumbing (1).
Bedbugs
The owner reported 2 infested units in the last 3 years. HPD's bedbug filings are self-reported by the owner once a year; HPD does not inspect to confirm them.
- 2026: No bedbug filing on record for this year
- 2025: Owner reported 0 infested units
- 2024: Owner reported 0 infested units
- 2023: Owner reported 2 infested, 2 treated, 0 re-infested
- 2022: Owner reported 0 infested units
- 2021: Owner reported 0 infested units
Buildings department (DOB)
1 open DOB violation, a Local Law violation issued before 2000. 1 DOB violation on record. Check on DOB BIS.
Evictions and housing court
0 executed evictions in the last 3 years (0 on record). 0 open HPD cases; 0 harassment findings.
Rent stabilization
8 of 20 units rent-stabilized as of 2024. Stabilized renewals: 0% for one year and 0% for two years under RGB Order #58 (Oct 1, 2026 to Sep 30, 2027).
Rent-stabilized units on city tax bills: 8 in 2024, 15 in 2007. Source: DOF tax bills for 2007 and 2024; years with no bill on file are left out.
Owner and management
Owner: SLOPE ON 4TH LLC. Head officer: MARK WEINBERGER. Managing agent: SLOPE ON 4TH LLC. This owner has 40 buildings on record, 14 graded D or F. See the full portfolio.
Last HPD registration Jul 28, 2026, valid through Sep 1, 2027.
Tax lot and city IDs
BBL 3006370003, HPD building ID 129419. HPD Online, ACRIS, DOB BIS.
Nearest subway
- Prospect Av (R), 3 min walk
- 25 St (R), 5 min walk
- 4 Av-9 St (F, G), 11 min walk
How the grade is calculated
| Factor | On record | Points |
|---|---|---|
| Open HPD violations | 3 open (2 class B, 1 class A) | −10 |
| 311 housing complaints (12 mo) | 3 | −8 |
| Bedbug reports (3 yr) | 2 infested units | −15 |
| Executed evictions (3 yr) | None | 0 |
| Housing litigation | No open cases | 0 |
| Open DOB violations | 1 open DOB violation, a Local Law violation issued before 2000 | 0 |
Sources: NYC HPD Housing Maintenance Code Violations, NYC 311 Service Requests, NYC HPD Bedbug Reporting, NYC Marshal Evictions (DOI), NYC HPD Housing Litigations, NYC DOB Violations, NYC DOF tax bills (via JustFix Who Owns What portfolio API, v2), NYC HPD Property Registration. Methodology. Report generated 2026-10-28.